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Study of the mass and spin-parity of the Higgs boson candidate via its decays to Z boson pairs

S. Chatrchyan M. Besançon 1 S. Choudhury 1 F. Couderc 1 M. Dejardin 1 D. Denegri 1 B. Fabbro 1 J.L. Faure 1 F. Ferri 1 S. Ganjour 1 A. Givernaud 1 P. Gras 1 G. Hamel de Monchenault 1 P. Jarry 1 E. Locci 1 J. Malcles 1 L. Millischer 1 A. Nayak 1 J. Rander 1 A. Rosowsky 1 M. Titov 1 S. Baffioni 2 F. Beaudette 2 L. Benhabib 2 L. Bianchini 2 M. Bluj 2 Pierre Busson 2 C. Charlot 2 N. Daci 2 T. Dahms 2 M. Dalchenko 2 L. Dobrzynski 2 A. Florent 2 R. Granier de Cassagnac 2 M. Haguenauer 2 P. Mine 2 C. Mironov 2 I.N. Naranjo 2 M. Nguyen 2 C. Ochando 2 P. Paganini 2 D. Sabes 2 R. Salerno 2 Y. Sirois 2 C. Veelken 2 A. Zabi 2 J.-L. Agram 3 J. Andrea 3 D. Bloch 3 D. Bodin 3 J.-M. Brom 3 E.C. Chabert 3 C. Collard 3 E. Conte 3 F. Drouhin 3 J.-C. Fontaine 3 D. Gele 3 U. Goerlach 3 P. Juillot 3 A.-C. Le Bihan 3 P. van Hove 3 S. Beauceron 4 N. Beaupere 4 O. Bondu 4 G. Boudoul 4 S. Brochet 4 J. Chasserat 4 R. Chierici 4 D. Contardo 4 P. Depasse 4 H. El Mamouni 4 J. Fay 4 S. Gascon 4 M. Gouzevitch 4 B. Ille 4 T. Kurca 4 M. Lethuillier 4 L. Mirabito 4 S. Perries 4 L. Sgandurra 4 V. Sordini 4 Y. Tschudi 4 P. Verdier 4 S. Viret 4 
Abstract : A study is presented of the mass and spin-parity of the new boson recently observed at the LHC at a mass near 125 GeV. An integrated luminosity of 17.3 inverse femtobarns, collected by the CMS experiment in proton-proton collisions at center-of-mass energies of 7 and 8 TeV, is used. The measured mass in the ZZ channel, where both Z bosons decay to e or mu pairs, is 126.2 +/- 0.6 (stat.) +/- 0.2 (syst.) GeV. The angular distributions of the lepton pairs in this channel are sensitive to the spin-parity of the boson. Under the assumption of spin 0, the present data are consistent with the pure scalar hypothesis, while disfavoring the pure pseudoscalar hypothesis.
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Submitted on : Monday, February 25, 2013 - 12:08:26 PM
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S. Chatrchyan, M. Besançon, S. Choudhury, F. Couderc, M. Dejardin, et al.. Study of the mass and spin-parity of the Higgs boson candidate via its decays to Z boson pairs. Physical Review Letters, American Physical Society, 2012, 110, pp.081803. ⟨10.1103/PhysRevLett.110.081803⟩. ⟨in2p3-00794202⟩

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